Eupanisellus kazakhstanicus, Tuzovskij & Stolbov, 2021

Tuzovskij, Petr V. & Stolbov, Vitaly A., 2021, A new water mite genus from Kazakhstan (Acari, Hydrachnidia, Hydryphantidae), Zootaxa 4951 (1), pp. 187-192 : 188-189

Eupanisellus kazakhstanicus n. sp.

( Figs 1–13 )

Type series. Holotype: male, slide 9919, Asia , Kazakhstan, Turkestan Province, Tyulkubaskiy District, Aksu-Zhabagly Nature Reserve, stream Taldybulak, 42°24’04.4”N 70°28’13.7”E, 1450 м, depth 30–40 cm, ground: stones, mosses, 10.08.2019, leg. V. Stolbov . Paratypes: 5 males, 2 females and 10 deutonymph, same locality and data as holotype .

Diagnosis. As for genus.

Description. Both sexes. Idiosoma elongate and flattened ( Figs 1–2 ). Colour red. Idiosomal chaetom typical for the family Hydryphantidae ( Tuzovskij 1987) . Trichobothria Fp and O i not associated with glandularia, other idiosomal setae associated with glandularia. Setae Fch ( Fig. 3 ) short, thick, trichobothria Fp and Oi long, thin ( Fig. 4 ), other idiosomal setae ( Fig. 5 ) comparatively thick and a little longer than Fch. Membranous interspaces papillate ( Fig. 6 ). Lateral eyes in capsules, eye lenses fused to each other on each side ( Fig. 7 ). Pre- and postfrontalia and first pair of dorsocentral platelets fused into rather large frontal plate bearing median eye and trichobithria Oi in its anterior part. Fifth pair of dorsocentral plates larger than other dorsocentral platelets. All dorsolateral platelets (dl.1–dl.4) and dc.2- dc.4 subequal in size. Third pair of dorsocentral platelets medially fused in male and separate in female. All dorsal platelets plates occupying less than one half of the idiosoma dorsal surface.

Coxal plates in four groups. Number and arrangement of setae on coxal plates as shown in Fig. 2 . Anterior coxal groups with rounded medial margin and distinctly separated. Posterior coxal groups widely separated, medial parts of coxae III and IV subequal in shape. Genital field situated between posterior coxal groups. Number of genital acetabula variable, two (occasionally three) acetabula anterior and four to seven acetabula posterior to the genital flaps on each side ( Figs 8–10 ). Two to four genital setae located on a small sclerite anterior to the genital field, and one (occasionally two) seta posterior to genital field on each side. Pregenital and postgenital sclerites small and subequal in shape and size. Excretory pore surrounded by a sclerotized ring. Genital field and excretory pore well separated.

Capitulum robust, in lateral view with equally S-shaped ventral margin and long rostrum ( Fig. 9 ).

Chelicera ( Fig.10 ) with large basal segment and comparatively short crescent chela.

Pedipalp rather slender ( Fig. 11 ): P-1 with single short dorsodistal seta; P-2 large, with short straight ventral margin, three short subequal dorsoproximal and three unequal dorsodistal setae; P-3 ventral margin straight or convex, with two unequal dorsodistal setae; P-4 long, with dorsodistal margin bearing peg-like seta, one or two thin dorsodistal setae and two ventrodistal ones.

Legs very stout and densely covered with strong setae. Shape and arrangement of setae on legs I–IV as shown in Figs 15–18 . All legs claws strong, subequal in shape but claws of legs IV ( Fig. 19 ) larger than others claws.

Male. Ejaculatory complex ( Fig. 8 ) proximal chamber large oval, proximal arms broadest basally, tapering gradually to apex and not reaching to anterior margin of proximal chamber; distal arms slightly developed with obtuse tips. Each genital flap usually with 11–17 setae ( Fig. 12 ) but occasionally one genital flap with rather numerous setae ( Fig. 13 ).

Measurements (n=5). Idiosoma L 700–810, W 550–500; frontal plate L 160–185, W 115–150; genital flap L 130– 165, W 120–125; capitulum L 175–190, rostrum L 50–55; cheliceral segments: base L 150–165, chela L 45–50; pedipalp segments (P-1–5) L: 30–40, 75–85, 62–87, 85–90; 30–37; legs segments L: I-Leg-1–6: 60–70, 75–80, 55–65, 80–95, 95–100, 85–100; II-Leg-1–6: 70–75, 75–80, 65–75, 75–100, 110–115, 110–125; III-Leg-1–6: 60–75, 80–85, 85–100, 65–80, 110–115, 125–140, 125–135; IV-Leg-1–6: 125–150, 80–100, 85–100, 160–200, 135–150, 135–150.

Female. Larger than male. Gonopore much longer than genital flaps ( Fig. 14 ). Each genital flap with 11–16 setae.

Measurements (n=2). Idiosoma L 800–100, W 625–650; frontal plate L 185–215, W 160–175; genital flap L 210– 220, W 160–190; capitulum L 225–250, rostrum L 60–75; cheliceral segments: base L 185–215, chela L 50–65; pedipalp segments (P-1–5) L: 35–45, 80–90, 40–55, 100–112, 25–30; legs segments L: I-Leg-1–6: 75–90, 95–100, 75–90, 85–100, 120–125, 110–115; II-Leg-1–6: 80–90, 95–100, 80–90, 120–125, 135–140, 145–150; III-Leg-1–6: 85–100, 95–100, 85– 100, 135–150, 145–150, 160–175; IV-Leg-1–6: 150–165, 110–125, 120–125, 240–250, 160–175, 175–190.

Deutonymph (juvenile). General morphology similar to female, but with the following differences: Setae Pi not associated with glandularia, all idiosomal platelets comparatively slightly developed, distinctly developed only frontal plate; dorsocentral and dorsolateral platelets hardly visibly, lower number of setae on coxal plates ( Fig. 20 ) and legs ( Figs 21–22 ). Capitulum (Fig. 23) with short rostrum. P-1of pedipalp (Fig. 24) without seta; P-2 ventral margin straight, with three subequal distal setae; P-3 ventral margin straight or slightly convex, with two unequal dorsodistal setae; P-4 long, with dorsodistal projections bearing stout seta, and three thin distal setae, one dorsally, the others ventrally. Genital field with two pairs of unequal acetabula and two pairs of setae. Posterior acetabulum larger than anterior one on each side. Genital flaps rudimentary and bearing posterior seta, anterior genital seta located on small sclerite anterior to genital field on each side.

Measurements (n=10). Idiosoma L 360–550, W 250–420; genital flap L 210–220, W 160–190; ac.1–2 D 15–20, 21–25; capitulum L 95–110, rostrum L 12–18; cheliceral segments: base L 85–90, chela L 23–25; pedipalp segments (P- 1–5) L: 15–18, 36–48, 24–30, 54–65, 15–18; legs segments L: I-Leg-1–6: 30–42, 30–42, 24–30, 35–45, 53–55, 48–60; II-Leg-1–6: 30–42, 35–45, 30–35, 42–50, 54–60, 60–75; III-Leg-1–6: 35–45, 35–45, 30–35, 48–60, 60–72, 70–85; IV- Leg-1–6: 50–75, 40–55, 40–48, 80–100, 65–80, 70–85.

Etymology. The species is named after the name of the country ( Kazakhstan) where it was collected.

Habitat. Running waters.

Distribution. Asia, Kazakhstan: Turkestan Province.

Figures

FIGURES 1–8. Eupanisellus kazakhstanicus n. sp., male: 1, dorsal view; 2, ventral view; 3, seta Fch; 4, seta Fp; 5, seta Vi; 6, fragment of integument; 7, eye capsule; 8, ejaculatory complex. Scale bars: 1–2 = 200 μm.

FIGURES 9–14. Eupanisellus kazakhstanicus n. sp., adult: 9, capitulum; 10, chelicera; 11, pedipalp; 12,14, genital field; 13, right half of genital field; 9–13 male, 14, female. Scale bars: 9–13 = 50 μm, 14 = 100 μm.

FIGURES 15–19. Eupanisellus kazakhstanicus n. sp., male: 15, leg I; 16, leg II; 17, leg III; 18, leg IV; 19, claws of leg IV. Scale bars: 15–18 = 100 μm, 19 = 50 μm.

FIGURES 20–22. Eupanisellus kazakhstanicus n. sp., deutonymph: 20, coxal field and genital field, ventral view; 21, I-Leg-1–6; 22, IV-Leg-1–6; 23, capitulum, lateral view; 24, pedipalp. Scale bars: 20 = 100 μm, 21–22, 23–24 = 50 μm.